Fiber Optics and Optical Communication

Theoretical and experimental investigations of metal sulfide dielectric coatings for hollow waveguides

[+] Author Affiliations
Moshe Ben-David

Tel Aviv University, Bio-Engineering Department, Tel Aviv, Israel

Merav Catalogna

Tel Aviv University, Bio-Engineering Department, Tel Aviv, Israel

James Harrington

Rutgers, The State University of New Jersey, Department of Materials Science and Engineering, Piscataway, New Jersey 08845

Veena Krishnan (Gopal)

Mary Institute and Saint Louis Country Day School, US Math Department, St. Louis, Missouri 63124

Israel Gannot

Tel Aviv University, Bio-Engineering Department, Tel Aviv, Israel and George Washington University, School of Engineering, Electrical and Computer Engineering Department, Washington, DC 20052

Opt. Eng. 47(4), 045008 (April 30, 2008). doi:10.1117/1.2896538
History: Received January 03, 2007; Revised October 24, 2007; Accepted October 27, 2007; Published April 30, 2008
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Continuous efforts to develop low-loss flexible waveguides, to transmit mid-IR laser energy for minimally invasive surgical and diagnostic procedures, have been carried out by us and other groups. We have introduced sulfide dielectric films coated over an Ag reflecting layer as another potential solution. The metal sulfides used have high transparency in the IR spectrum, and their thickness can be tailored to minimize the attenuation over a selected wavelength range. The high refractive index contrast of the two metal sulfide materials enables us to produce multilayer hollow waveguides. These waveguide will have low attenuation in both straight and bent conditions, low sensitivity to coupling and to surface roughness, and a broad wavelength range. The lowest loss for a straight guide, measured at 1.55μm for a 1,000-μm-bore AgCdSPbSCdS hollow glass waveguide (HGW), was 0.06dBm. This loss is three times less than that measured for a single-layer AgCdS-coated HGW at 1.55μm. A theoretical simulation applying the same conditions showed the same pattern with a good potential for improvement.

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© 2008 Society of Photo-Optical Instrumentation Engineers

Citation

Moshe Ben-David ; Merav Catalogna ; James Harrington ; Veena Krishnan (Gopal) and Israel Gannot
"Theoretical and experimental investigations of metal sulfide dielectric coatings for hollow waveguides", Opt. Eng. 47(4), 045008 (April 30, 2008). ; http://dx.doi.org/10.1117/1.2896538


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